If it is fasting blood glucose, blood glucose 6.4 mmol/L is above the normal range, it is impaired fasting blood glucose, blood glucose 6.4 mmol/L may be reversed if blood glucose control is strengthened, and may develop into diabetes mellitus if left unchecked, but there is no definitive time value. In the case of 2-hour postprandial blood glucose, it is within the normal range. The presence of typical symptoms of diabetes mellitus, together with a fasting blood glucose ≥ 7 mmol/L, or a 2-hour postprandial blood glucose ≥ 11.1 mmol/L, leads to the diagnosis of diabetes mellitus. In the case of fasting blood glucose 6.4mmol/L, which does not currently meet the criteria for diabetes, it is an abnormality of glucose tolerance, which may be reversed if blood glucose control is strengthened, or may develop into diabetes if not controlled, but there is no clear time for pre-diabetes to develop into diabetes. The normal value of 2-hour postprandial blood glucose should be less than 7.8mmol/L, so the 2-hour postprandial blood glucose of 6.4mmol/L belongs to the normal range. Normally, you should adopt a healthy lifestyle, eat a light diet, need to convert the calorie prescription according to the daily calorie intake, set the proportion of intake of sugar, fat and protein, and carry out appropriate aerobic exercise, such as walking, jogging, cycling, etc. Aerobic exercise can improve the sensitivity of insulin. Blood glucose 6.4mmol/L should be regular blood glucose self-monitoring, if necessary, should go to the hospital in time to consult the doctor, after clarifying the cause of the disease under the guidance of the doctor standardized treatment.